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We investigated Carbon Buckypaper with respect to field emission properties, especially long-term field emission stability and under well-defined stress conditions. The Carbon Buckypaper field emitters showed a threshold field strength of about 1Vμm -1 for an emission current of 1nA. Field emission current densities of more than 10mAcm -2 are measured for higher applied field...
A novel process for growth of carbon nanotubes using plasma processes is reported. This process consists of formation of nanotips on substrate and growth of carbon nanotubes on it. The formation of the nanotips, which were formed under an intention to control formation of catalyst nanoparticles, was carried out on substrates by reactive ion etching. After the nanotips formation, the carbon nanotubes...
This article treats the influence of the treatment of a Ni catalyst upon the growth of carbon nanotubes in alcohol catalytic chemical vapour deposition (AC CVD) equipment. Prior to the growth of diamond, a thin film of Ni was deposited on a silicon substrate by magnetron sputtering. We observed that a combination of annealing of the Ni catalyst in vacuum and NH 3 had a positive effect upon...
Field emission (FE) properties of individual single-walled carbon nanotubes (SWCNT) were investigated inside a field emission-scanning electron microscopy. The individual SWCNT turned on a voltage of 23V defined to produce a current of 10pA, and was saturated at around 43V and 880nA. The FE characteristic of individual SWCNT also followed a conventional Fowler–Nordheim (F–N) theory in which a single...
This paper describes the influence of a co-catalyst on growth of carbon nanotubes (CNTs) by alcohol catalytic chemical vapour deposition (ACCVD) method. Silicon wafers covered with thermal oxide or polycrystalline diamond thin film were used as substrates. Ni thin film supported with Al, Cu or Ti was used as a catalyst. The films were deposited by pulsed laser deposition technique. Comparison of the...
Growth of carbon nanofibers and nanotubes by combination of aerosol synthesis and plasma-enhanced catalytic chemical vapor deposition with alcohol as carbon precursor is presented. Only a hollow cathode glow discharge (HCGD) is used as gas activation process without any specific heating of the substrate. Specially designed hollow cathode enables the evaporation of catalyst directly on the substrate...
The aim of this work was to study the relationship between parameters of the electron field emission and the film deposition method. In this study two methods were applied: classical radio frequency plasma-assisted chemical vapor deposition (RF PACVD) to produce diamond-like carbon (DLC) layers and chemical vapor deposition (CVD) to produce carbon nanotubes (CNT). DLC layers were grown on n-type silicon...
High magnetic fields up to 10T are applied to thermal chemical vapor deposition (CVD) for carbon nanotube synthesis in order to control the nanotube morphology. Although changes of the nanotube morphology in the presence of magnetic field were not obviously discernible in the SEM images, an increase in the onion-like nano-carbons due to magnetic field was observed by TEM. It suggests that the magnetic...
Plasma enhanced chemical vapor deposition (PECVD), which enables growth of vertically aligned carbon nanotubes (CNTs) directly onto a solid substrate, is considered to be a suitable method for preparing CNTs for nanoelectronics applications such as electron sources for field emission displays (FEDs). For these purposes, establishment of an efficient CNT growth process has been required. We have examined...
Carbon nanotubes (CNTs) have been used as the electrochemical double layer in capacitor (EDLC) electrodes. CNTs were synthesized using thermal chemical vapor deposition (CVD) at a growth temperature of 750°C by flowing C 2 H 2 . The surface morphology of the synthesized CNTs could be controlled with or without Al film deposition between the stainless (SUS) sheet and Fe catalyst film...
We have selectively fabricated carbon nanotubes (CNTs) emitter arrays with a micro mold in capillary (MIMIC) assisted process. The electron emitter growth site was fabricated by resist patterning using the MIMIC process. The pattern was uniformly transferred to the substrate and well aligned CNTs were grown. The emitter produces a turn-on field of 2.7V/μm with a field emission current of 10μA/cm ...
Zinc oxide (ZnO) nanostructures were grown on vertically aligned carbon nanotubes (CNTs) using thermal chemical vapor deposition (CVD) to enhance the field emission characteristics. The shape of ZnO nanostructure was tapered. Scanning electron microscopy (SEM) image showed the ZnO nanostructures were grown onto CNT surface uniformly. The field electron emission of pristine CNTs and ZnO-coated CNTs...
We report an electron spectroscopy study on Na + ion implantation and Na atom deposition on carbon structures. Our results show that, for implanted Na at the same ion dose, the Na surface concentration decreases with the structure order, while deposited Na particles readily diffuse in the bulk.
We report the structural modifications of vertically grown carbon nanotubes (VCNT) by plasma ion bombardments. The VCNT were grown by thermal chemical vapor deposition (CVD) using acetylene feedstock with iron catalyst and alumina supporting layers on silicon substrate. The plasma ion bombardments were performed using DC plasma enhanced CVD with parallel electrodes configuration. As a result, the...
The patterned electron field emission of printed carbon nanotube (PCNT) films using image transfer technology is reported. If we transfer an image to the surface of PCNT films, such as using a stamp, the emission image of PCNT films will be the transferred pattern. Based on many experiments, we are convinced that the essential feature of pattern emission from PCNT films by image transfer technology...
We overview recent developments in the fabrication of the world’s smallest electrode, the carbon nanotube via chemical vapour deposition (CVD) and demonstrate how these electrodes are beneficially utilised and tailored towards the electrochemical sensing of target analytes. The use of carbon nanotubes arrays grown via CVD to beneficially tailor the arrays to their intended electro-analytical application...
The multiwalled carbon nanotubes (MWCNTs) were prepared on SiO 2 substrates using chemical vapor deposition (CVD). N ion beam bombardment to MWCNTs was performed at different beam currents of 5–15 mA in an ion-beam-assisted deposition (IBAD) system. Scanning electron microscope (SEM) and Transmission electron microscope (TEM) proved no significant crack and surface morphological change for...
A facile method was designed and developed to fabricate 3D carbon material, from inducing the growth of 1D carbon nanotubes (CNT) on to the reduced 2D graphene oxide sheets (rGO). In this method, nickel nanoparticles were firstly loaded onto graphene oxide sheets that were modified by surfactant sodium dodecyl sulfate (SDS). Then CNTs were induced to grow on nickel-loaded graphene oxide sheets via...
Carbon nanotubes (CNTs) were introduced into carbon fiber felts by electrophoretic deposition (EPD) and then pyrocarbon (PyC) was infiltrated in the felts by thermal gradient chemical vapor infiltration using methane as precursor to prepare carbon nanotube (CNT) reinforced carbon/carbon composites (CNT-C/C composites). The effects of CNTs by EPD on microstructure, mechanical and thermal properties...
Carbon nanotube films (CNT-1 and CNT-2) were fabricated in a vertical CVD gas flow reactor with water sealing. CNT-1 films consist of ordered crystalline carbon nanotubes, while CNT-2 are defective carbon nanotube films. The films are flexible and transferrable and can be used as binder-free anodes for lithium-ion batteries (LIB). Electrochemical measurements show that CNT-2 possess a reversible capacity...
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